<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style type="text/css">
        *{
            margin: 0;
            padding: 0px;
        }
        body{
            background-color: #FFFFFF;
        }
        #content{
            float: left;
        }
        #content.left{
            width: 50%;
            height: 100%;
        }

        #content.right{
            width: 50%;
            height: 100%;
            background-color: orangered;
        }
    </style>
</head>
<body>
    <div id="content">
        <div class="left">

        </div>
        <div class="right">

        </div>


    </div>

</body>
</html>